T or f positive always means good

Is there any species that went extinct in recent years due to natural causes (not caused by human interaction). if so, what caused it?

Gregor mendel is best known for his work with pea plants and for uncover many of the mysteries of genetics. one of his major findings stated that there were specific, physical units of inheritance that are transmitted during reproduction. what is the the name given to these units of inheritance which can be found on chromosomes? a) centromeres b) cytoplasm c) genes d) nucleotides

Why do mountaineers become breathless as they reach high altitudes